EP0434755A1 - Extruded biaxially stretched foam plastic pipe and procedure for the manufacture thereof - Google Patents
Extruded biaxially stretched foam plastic pipe and procedure for the manufacture thereofInfo
- Publication number
- EP0434755A1 EP0434755A1 EP89911111A EP89911111A EP0434755A1 EP 0434755 A1 EP0434755 A1 EP 0434755A1 EP 89911111 A EP89911111 A EP 89911111A EP 89911111 A EP89911111 A EP 89911111A EP 0434755 A1 EP0434755 A1 EP 0434755A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pipe
- temperature
- plastic
- process according
- biaxially stretched
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
- B29C44/507—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying extruding the compound through an annular die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/56—After-treatment of articles, e.g. for altering the shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
- B29C55/26—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes biaxial
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/127—Rigid pipes of plastics with or without reinforcement the walls consisting of a single layer
Definitions
- the invention relates to an extruded, biaxially stretched plastic pipe.
- Said application describes the moulding of a bia x i a l l y stretched pipe in which the pipe has a wall composed of solid plastic.
- Solid is understood to mean in this case that the plastic is homogenously composed of plastic and that no bubble-type cavities are present.
- the present application now relates to a pipe of the above- mentioned type, the pipe being, however, a foam plastic pipe.
- the foam plastic pipe is provided with a continuous smooth structure on the inside and the outside.
- the smooth structure advantageously has the form of solid layers having a thickness of at least 0.1 mm, preferably at least 1 mm.
- the material of the solid layers may be identical to the material of the interior of the pipe wall but may also differ therefrom; the materials from which the layers are formed may also be different from each other.
- such a layered structure can be achieved by using a coextrusion procedure, although other procedures which do not make use of coextrusion are also available.
- the invention also relates to a process for manufacturing a biaxially stretched plastic pipe at least comprising the step's of:
- the starting point is a pipe which is manufactured from foam plastic which has, or does not have, a continuous smooth structure on the outside and inside and in that, after being moulded by extrusion and foaming, the pipe is sized and is then cooled to below the extrusion temperature and is stretched.
- the plastic solid-wall pipe is biaxially stretched immediately after being moulded. It has now been found that the pipe can be processed in a plurality of ways during the biaxial stretching.
- the p i p e may be cooled to ambient temperature and subsequently heated again to stretching temperature and then biaxially stretched.
- the pipe After being moulded, the pipe may also be cooled to stretching temperature and biaxially stretched at said temperature.
- the mechanical properties of the foam plastic pipe being appreciably improved with respect to those of the pipe in the unstretched state.
- the pipe is temDered before the stretching is carried out.
- a tempering can be carried out in a variety of manners; a suitable manner is that in which the pipe is kept for a period of time at a temperature which is equal to the stretching temperature. Another method of tempering is to heat the pipe to a suitable value above the stretching temperature, keep it at said temperature for a certain time and then cool it again to the stretching temperature, after which the stretching can subsequently be carried out.
- the tempering time and, if applicable, the difference between the tempering; temperature and the stretching temperature may typically vary between 10 m i n u t e s and approx 1 hour, and 5 and 25°C respectively.
- a discontinuous procedure will, in general, be chosen; a continuous procedure is, however, by no means excluded.
- the pipe after being moulded and foamed, the pipe is cooled to a temperature which is at least 50°C below the temperature at which the pipe has been moulded.
- extrusion and foaming is carried out at 196°C, after which the pipe is sized and subsequently it is cooled to 120°C before carrying out the stretching operation.
- the process according to the invention can be carried out either discontinuously or continuously, a foam plastic pipe being obtained in both cases having the advantages as described earlier.
- the process can be carried out in a manner such that a biaxially stretched foam pipe is obtained whose wall is constructed of a plurality of distinguishable layers by using coextrusion in an apparatus having one or more extruder heads.
- the distinguishable layers may in that case consist of the same plastic; the materials may, nowever, also be different.
- a foam plastic pipe is indicated by the reference numeral 1, while the wall of the pipe is indicated by 2.
- the wall 2 is composed, as is indicated very diagrammatically, of a plastic which is constructed of closed cells 5.
- the plastic may be a plastic of the polyvinyl chloride type; other types of plastic such as polythene, polypropene and polystyrene may also be converted to foam form and biaxially stretched.
- the walls of the pipe are indicated by 3 and 4 respectively. These walls may also have a foam plastic structure; said walls 3 and 4 may, however, also have a continuous smooth structure which is obtained by carrying out the extrusion of the pipe under special conditions, as a result of which, a smooth nature is obtained on the outside and inside boundary of the wall.
- the biaxially stretched foam plastic oioes have proved extremely suitable for use in pipelines for conveying liquids and/or gases.
- the pipe according to the invention has a specific tangential initial rigidity value of minimally 2 kN/m 2 as determined according to ISO DP 9969 (1988).
- the pipes according to the invention are specifically suitable for conveing domestic and industrial waste water, rain and the like in sewage systems.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
L'invention concerne un tube (1) étiré biaxialement en matière plastique expansée. Ledit tube (1) peut comporter sur ses côtés intérieur et extérieur une structure lisse continue telle que les couches (3, 4). Les couches (3, 4) peuvent être composées du même plastique que ledit tube ou dans un autre mode de réalisation elles peuvent être d'une matière différente. L'invention concerne également un procédé de fabrication d'un tel tube en plastique expansé étiré biaxialement.The invention relates to a biaxially stretched tube (1) made of expanded plastic. Said tube (1) may have on its inner and outer sides a continuous smooth structure such as the layers (3, 4). The layers (3, 4) can be made of the same plastic as said tube or in another embodiment they can be of a different material. The invention also relates to a method of manufacturing such a biaxially stretched expanded plastic tube.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8802304A NL8802304A (en) | 1988-09-16 | 1988-09-16 | EXTRUDED, BIAXIAALLY PROVIDED FOAM PLASTIC TUBE AND METHOD FOR THE MANUFACTURE THEREOF |
NL8802304 | 1988-09-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0434755A1 true EP0434755A1 (en) | 1991-07-03 |
Family
ID=19852920
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89911111A Pending EP0434755A1 (en) | 1988-09-16 | 1989-09-13 | Extruded biaxially stretched foam plastic pipe and procedure for the manufacture thereof |
EP89202309A Withdrawn EP0361580A3 (en) | 1988-09-16 | 1989-09-13 | Extruded biaxially stretched foam plastic pipe and procedure for the manufacture thereof |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89202309A Withdrawn EP0361580A3 (en) | 1988-09-16 | 1989-09-13 | Extruded biaxially stretched foam plastic pipe and procedure for the manufacture thereof |
Country Status (6)
Country | Link |
---|---|
EP (2) | EP0434755A1 (en) |
AU (1) | AU4332389A (en) |
DK (1) | DK34491D0 (en) |
FI (1) | FI911293A0 (en) |
NL (1) | NL8802304A (en) |
WO (1) | WO1990002649A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4886112A (en) * | 1988-01-21 | 1989-12-12 | Ashland Oil, Inc. | Method for cleaning exterior surfaces of fire-heated tubes |
US5239786A (en) * | 1992-04-22 | 1993-08-31 | Pangborn Corporation | Inside pipe cleaner |
US5453235A (en) * | 1993-01-29 | 1995-09-26 | Impra, Inc. | Method of forming dual porosity FTFE tubes by extrusion of concentric preforms |
FI100130B (en) * | 1995-12-12 | 1997-09-30 | Uponor Innovation Ab | Multilayer plastic pipe |
DE29714571U1 (en) * | 1997-08-14 | 1997-10-30 | Rehau Ag + Co, 95111 Rehau | Multilayer pipe |
GB9804572D0 (en) * | 1998-03-05 | 1998-04-29 | Witter Ronald R C | Improvements in pipes |
DE102005023148B4 (en) | 2005-05-13 | 2009-07-30 | Airbus Deutschland Gmbh | Pipeline for the passage of air for air conditioning in aircraft |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1428652A (en) * | 1964-03-03 | 1966-02-18 | Haveg Industries Inc | Thermoplastic polymer foam stretched then heat contracted |
GB1382580A (en) * | 1971-06-28 | 1975-02-05 | Yorkshire Imperial Plastics | Pipes |
NO139727C (en) * | 1972-11-29 | 1979-05-02 | Petzetakis George A | METHOD AND DEVICE FOR THE MANUFACTURE OF A THERMOPLASTIC MATERIAL HOSE |
US4272468A (en) * | 1978-01-03 | 1981-06-09 | Conwed Corporation | Method for reducing the aging period of polyethylene foams |
US4322260A (en) * | 1979-04-04 | 1982-03-30 | Monsanto Company | Process for the continuous extrusion forming of a plastic double-walled foam-core conduit |
US4731002A (en) * | 1986-11-19 | 1988-03-15 | American Maplan Corporation | Triple-wall foam coextrusion apparatus |
DE8712082U1 (en) * | 1987-09-05 | 1988-08-04 | Hewing GmbH & Co, 4434 Ochtrup | Self-supporting element |
-
1988
- 1988-09-16 NL NL8802304A patent/NL8802304A/en not_active Application Discontinuation
-
1989
- 1989-09-13 AU AU43323/89A patent/AU4332389A/en not_active Abandoned
- 1989-09-13 WO PCT/NL1989/000068 patent/WO1990002649A1/en not_active Application Discontinuation
- 1989-09-13 EP EP89911111A patent/EP0434755A1/en active Pending
- 1989-09-13 EP EP89202309A patent/EP0361580A3/en not_active Withdrawn
-
1991
- 1991-02-27 DK DK034491A patent/DK34491D0/en not_active Application Discontinuation
- 1991-03-15 FI FI911293A patent/FI911293A0/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9002649A1 * |
Also Published As
Publication number | Publication date |
---|---|
FI911293A0 (en) | 1991-03-15 |
NL8802304A (en) | 1990-04-17 |
AU4332389A (en) | 1990-04-02 |
EP0361580A2 (en) | 1990-04-04 |
DK34491A (en) | 1991-02-27 |
EP0361580A3 (en) | 1990-04-18 |
DK34491D0 (en) | 1991-02-27 |
WO1990002649A1 (en) | 1990-03-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 19901217 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
XX | Miscellaneous |
Free format text: VERFAHREN ABGESCHLOSSEN INFOLGE VERBINDUNG MIT 89202309.4/0361580 (EUROPAEISCHE ANMELDENUMMER/VEROEFFENTLICHUNGSNUMMER) VOM 14.08.91. |